Officers investigating an incident of arson in Bushey are making a further appeal for information.
The offence occurred between 10.15pm on Thursday, January 23 and 8am on Friday, January 24 at The Click Studios in Bushey High Street. An item was lit and placed near a wooden door causing serious damage to the property.
Kathy Ran the co-owner of Hot Zen Studios, who use the building, said she is "completely devastated" that they will have to remain closed for at least two months, with the damage being estimated at around £100,000.
Detective Constable Victoria Murray is investigating and said: "It is over a month since this incident occurred and whilst we have looked at a number of lines of inquiry, I would still like to hear from anyone else who may have any information which would assist our investigation.
"If you remember anyone coming home that night smelling of smoke or you know who is responsible please make that call."
Anyone with information is asked to contact Hertfordshire Police non-emergency number 101 quoting crime reference number J2/14/91. Alternatively call Crimestoppers anonymously on 0800 555 111.